UV Editor does not preview the corresponding image texture of selected object
Try to exit the edit mode (in the right half of the screen) and switch to &quot;rendered view&quot; instead of &quot;material preview&quot; on the top right. In this way your rendering engine (usually Eevee or Cycles) is used to generate the preview instead of the Viewport engine. Depending on the options you've chosen, they might only be available with these rendering engines.